Bolster for six-wheel trucks



J. A. LAMONT BOLSTER. FOR SIX-WHEEL TRUCKS Filed May 4,' 1923 Jun 17.1924.

une 17,1924. 1,498,391 J. A. LAMoN'r BOLSTER FOR SIX-WHEEL TRUCKS FiledMay 4, 1923- 3 Sheets-Sheet 5 J'OI'IN A. LAMONT, OF CHICAGO, ILLINOIS,ASSIGNORTO AMERICAN STEEL FOUNDRIES, 0F CHICAGO, ILLINOIS, A CORIORATIONOF NEW JERSEY.

BOLSTER FOR SIX-.WHEEL TRUCKS.

Application led May 4,

To all whom t may concern.'

Be it known that I, JOHN A. LAMoN'r, a

citizen of the United States, residing at Chicago, in the county of Cookand State of Illinois, have invented certain new and useful Improvements-in Bolsters for Six- VVheel Trucks, of which the following is aspecification.

This invention relates to a bolster for a six wheel truck.

The single integrally formed truck bolster having four legs as used inconnection with six wheel trucks does not always properly equalize theload transmitted through the center plate. In such a bolster on accountof its rigidity the load under certain truck conditions may beconcentrated on three or possibly two of the four legs, which tends todefeat other equalizing features there may be in the truck.

To facilitate load distribution there was provided a three piece bolsterfor six wheel trucks as disclosed in my Patent No. 1,377,- 706, grantedMay 10, 1921.

One object of my present invention is to provide a bolster which isreasonably flexible to facilitate a relatively uniform distri-- butionof the central plate load to the springs and at the same time simplifythe construction shown in said patent and reduce the weight and cost ofbolsters for six wheel trucks.

Another object is to provide a bolster for six wheel trucks which issimple and durable in construction and adapted to meet the variousrequirements of actual service conditions.

These and other objects are accomplished by means of the arrangementdisclosed on the accompanying sheets of drawings, in which- Figure 1 isa top plan view of a truck bolster embodying my invention;

Figure 2 is a side elevation of said bolster:

Figure 3 is a sectional view taken in the plane of line 3*3 of Figure 1;

Figure 4 is a sectional view taken in the plane of line 4 4 of Figure 1;

Figure 5 is an elevation of one end of the truck;

Figure 6 is a sectional view taken in the plane of line 6 6 of Figure 1;and

Figure 7 is an elevation of the end of the truck opposite to that shownin Figure 5.

The various novel features of the invens 1923. serial No. 636,541.

for six wheel trucks including a transverse bolster member 10 and asecond transverse bolster member 11', the ends of which are adapted torest directly upon supporting springs, said transverse bolster membersbeing provided with lugs 12 for assisting in positioning said springs,not shown. bolster also includes two longitudinally extending members13, the corresponding ends of which are formed integrally with one ofsaid transverse bolster members 10, the other corresponding ends ofthelongitudinal bolster members 13 terminating in a transf verse saddleportion or girder 14 which is rockably mountedv upon the transversebolster member 11. The ends of the transverse saddle member 14 areprovided with bearings 15 cooperating with stop portions 16 on saidtransverse bolster member 11 for limiting the relative rocking movementstherebetween.y and the ends of'said saddle member 14 cooperate with stopshoulders 17 forY limiting relative transverse movementsA of saidlongitudinal bolster members 13 and transverse bolstermember 11. Thesaddle portion 14 includes `downwardly extending legs 18 which straddlethe transverse bolster member 11 for definitely positioning thelongitudinal members 13 with respect to the transverse bolster member 11for'prevent-ing the bolster portions from getting out of square. Formedintegrally with the longitudinal bolster members 13 are upstandingbrackets having side bearings 18.

The equalizing bolster, in addition to in.

The

cluding the longitudinal bolster members 13 K and the transverse -girderor saddle member 14, includes l' the center plate member 19, f

which in this particular instance lI have chosen to make in a separatepiece to facilitate production, and, as a matter of fact, such piece,`when cast separately,` can be made of lighter sections and with asmoother center/plate than is practical when this portion is castintegrally with the other associated portions. This center plate member19 is designed to bear directly on the longitudinally extending bolster'members 13 and is secured in place by rivets 20 and against longitudinalmovement by lugs 2l Which engage Within Wall portions 22 on the sidebearing brackets 18.

This type or bolster may properly be termed a three-point bearingbolster, the enos of the transverse or fixed bolster member ll restingdirectly upon the associated springs (not shown) and the third bearingbeing that of the saddle or girder 14 rockably mounted upon thetransverse bolster ll. lt is apparent that this construction insures amore uniform distribution of the center plate load to the varioussprings than is possible with the integrally formed truck bolster havingfour corner legs which bear upon the four associated sets et' springs..it the same time this present bolster arrangement provides lor areduction in the weight over the three-piece bolster arrangementdisclosed in my above-mentioned patent by reason of the omission or thesaddle portion at one end and the change in distribution of load on thecross bolster member lll at that end., the load being delivered near thepoints of support instead ol2 at the cen-- ter, as is the ,case at theother end Where the transverse girder or saddle member l/l is roclrablysupported on the transverse bolster member l1.

lt is my intention to cover all modifications of the invention 'fallingwithin ythe spirit and scope of the following claims.

I claim:

l. A railway car truck bolster, including, in combination, two crossbolster members and a plurality of longitudinally extending bolstermembers integrally formed with one of said cross bolster members andhaving a connecting girder rockably associated with the other crossbolster member for equalize ing the transmitted load..

2. A railway car truck bolster, including, in combination, two crossbolster members and a plurality of other bolster members integrallyformed with one et said cross bolster members and having= a connectinggirder roclrably associated with the other cross bolster -member forequalizing the transmitted. load.

railway car truck bolster, including, in combination, two cross bolstermembers, a plurality of other bolster members integrally -formed withone of said cross bolster members and having a. connecting girderroclrably associated with the other cross bolster member for equalizingthe transmitted load, and a center plate member supported by said otherbolster members.

4. A railway car truck bolster, includ ing, in combination, two crossbolster members, a plurality of longitudinally extending 'cross bolstermembers ttor equalizi Ao' inesei bolster members integrally formed withone of said cross bolster members and having connecting girder rockablyassociated with the other cross bolster member for equalizu ingthetransmitted load, and a separate center plate member secured to saidlongiA tudinally extendingv bolster members.

A. railway car truck bolster, including, in combination, two Crossbolster members, a plurality oli other bolster members entend` .ing in adiilerent direction trom that oit the cross bolster members andintegrally formed with one of said cross bolster members and roclrabljvassociated with the other oit said y g the transmitted load, said otherbolster mem-- bers having side bearing members integr j 'formedtherewith, and a separate center plate member connecting said otherbolster members and prevented trom displacement by being interconnectedwith said side bear ingmembers.

o'. A railway car Vtruclr bolster, including. in combination, two crossbolster members, two longitudinallyv extending bolster membersintegrally Vformed with one of said cross bolster members and having aconnecting gir-der rockably i. sociated with the other oi said crossbolster members YPor equalizing the transmitted load, side bearingmembers integrally termed with said longitudinally extending bolstermembers, and a center plate bolster` member spanning saidlongitudii'ially extending bolster members and in terconnected therewithto prevent accidental disjilacemenl' with respect thereto.

7. railway car truck bolster, including, in combination, two crossbolster members, a plurality of other bolster members inte grally'formed with one of said cross bolster members and having a rockableassociation with said other cross bolster member for equalising thetransmitted load, and means for limi ing said rociiing motion by interensjagement of said last mentioned cross er member with said otherbolster memrailway car truck bolster, including, in combination, twocross bolster membe s. a plurality of longitudinally extending bolstermembers integrally formed with one olf said cross bolster members andhaving a connecting girder rockably associated with the other of saidCross bolster members for. equalizing the transmitted load, saidrocking` movement being limited by inter engagement o'f' one o'l saidcross bolster members and said girder member.

Signed at Chicago, Illinois, this 30th day of i-rprih l923.

JOHN A. LAMONT.

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